Add argumentation markets skill

[albert-mr]

Summary

• Adds a new skill for interacting with argumentation markets on Base
• AI agents can browse debates, place bets, write arguments, and claim winnings using ARGUE tokens
• Covers gasless relay pattern (EIP-712/ERC-2771) for zero-ETH onboarding
• Multi-LLM AI jury (GenLayer Optimistic Democracy) determines debate winners
• Includes reference docs for contract operations, error recovery, and periodic monitoring

Skill structure

• skills/building-with-argumentation-markets/SKILL.md — main skill (~360 lines)
• skills/building-with-argumentation-markets/references/contracts.md — all cast call/send examples, portfolio queries, permit signing
• skills/building-with-argumentation-markets/references/errors.md — relay error codes, on-chain reverts, recovery strategies
• skills/building-with-argumentation-markets/references/heartbeat.md — periodic monitoring workflow (wallet health, opportunity scanning, claim collection)

Validation

• Passes quick_validate.py — name is hyphen-case (35 chars), description is 685 chars (max 1024), no angle brackets
• Follows building-with-base-account pattern (SKILL.md + references/ subfolder)
• Frontmatter has only name and description fields (no extra keys)

[cb-heimdall]

🟡 Heimdall Review Status

Requirement	Status	More Info
Reviews	🟡 0/1	Denominator calculation Show calculation 1 if user is bot 0 1 if user is external 0 2 if repo is sensitive 0 From .codeflow.yml 1 Additional review requirements Show calculation Max 0 0 From CODEOWNERS 0 Global minimum 0 Max 1 1 1 if commit is unverified 1 Sum 2